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US 9,328,708 B2Granted
Fuel injection system of an internal combustion engine
AssigneeRobert Bosch GmbH
InventorFriedrich Boecking
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AssigneeRobert Bosch GmbH
InventorFriedrich Boecking
Estimating the term…
The invention relates to a fuel injection system of an internal combustion engine, comprising a presupply pump (1) and a downstream high-pressure pump (7), which is connected to a high-pressure accumulator (9) and wherein the high pressure accumulator (9) is operatively connected to at least one fuel injector (10). According to the invention, a fuel injection system is provided and a method for operating such a fuel system is described which avoids the disadvantage of a slow pressure build-up in the high-pressure accumulator (9) and rather allows a rapid start of the internal combustion engine. This is achieved in that the presupply pump (1) is designed to generate a delivery pressure by which a fuel injection by means of the fuel injector (10) is effected, at least in a defined operating state of the internal combustion engine. At the delivery pressure generated by the presupply pump (1), the fuel injector is prompted to open by a control device. A corresponding method for operating the fuel injection system provides for the presupply pump (1) to be operated in a starting operating mode until the internal combustion engine has been started, and after the internal combustion engine has been started to be operated in a presupply operating mode.
A fuel injection system of an internal combustion engine, comprising a pre-supply pump (1), a suction valve (5), and a downstream high-pressure pump (7) which is connected to a high-pressure accumulator (9) and the high-pressure accumulator (9) is operatively connected to at least one fuel injector (10), characterized in that the fuel injection system further comprises a fuel metering device (4) between the pre-supply pump (1) and the high pressure pump (7), wherein the pre-supply pump (1) is designed to generate a delivery pressure at which a fuel injection is effected by means of the fuel injector (10), at least in a defined operating state of the internal combustion engine, and wherein the pre-supply pump (1) supplies fuel through the fuel metering device (4) and to the high-pressure pump (7) via the suction valve (5).
A method for operating a fuel injection system of an internal combustion engine comprising a pre-supply pump (1), a suction valve (5), and a downstream high-pressure pump (7) which is connected to a high-pressure accumulator (9) which is operatively connected to a fuel injector (10), characterized in that the fuel injection system further comprises a fuel metering device (4) between the pre-supply pump (1) and the high pressure pump (7), wherein the pre-supply pump (1) is operated in a starting operating mode until the internal combustion engine has been started, in that during the starting operating mode a fuel injection is effected by the fuel injector (10) at the delivery pressure generated by the pre-supply pump (1) and in that the pre-supply pump (1) is operated in a pre-supply operating mode after the internal combustion engine has been started, and wherein, in both the starting operating mode and the pre-supply operating mode, the pre-supply pump supplies fuel through the fuel metering device (4) and to the high pressure pump (7) via the suction valve (5).
Dependencies are inferred from the claim text.